Diapering

In Heraldry, Diapering is a technique in which those who draw achievements of arms attempt to decorate large areas of flat colour by drawing crosshatches or arabesques. There is no standard, and each artist is allowed his own idiosyncracies. Diapering is not specified in the blazon, so a shield with diapering is considered the same as a shield of the same design but without diapering.